Steam-boiler.



M. W. SBWALL.

STEAM BOILER.

APPLICATION FILED JUNE 6, 1007.

.Patented June 10, .1913.

3 SHEETS-SHEET 1.

M. W. SBWALL.

STEAM' BOILER.

APPLIOATIUN FILED JUNE e, 1907.

1,064,174. Patented June 10,1913.

3 SHEETB-SHEET Z.

run shari;

MINOTT W. SEWALL, OF ROSELLE, NEW

COMPANY, OF BAYONNE,

ATENT OFFlCE.

STEAM-BOILER.

Specification of Letters Patent.

Patented J une 10,1913.

Application filed .Tune 6, 1907. Serial No. 877,503.

To all whom t may concern Be it known that I, MINo'rr lV. Sawmill, a citizen of the United States, residing' at Roselle, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to steam boiler plants wherein a plurality of steam boilers are arranged at different elevations with a ,feed water supply connected to the boiler most remote from the furnace and therefrom with the other boilers. An example is referred to in U. S. Letters Patent No. 772,435, granted to mc October 18, i90-l, in which a plurality of steam boilers are super posed and include steam boilers ot' a water tube type. In the patent referred to the steam and water circulation ot' the boiler elements are in communication and the feed water4 supply connection is i'nade directly with the drum of the upper groups of tubes, and the drums of the lower groups of tubesl are fed from the upper drum by gravity after the temperature of the feed water has been raised to the temperature of the steam.

In the present embodiment of my invention two separate boiler elements of a usual form are shown composed of standard partsv and having independent water circulations with interdependent water sup )ly and steam discharee and common circulation of the gases ofl combustion from one furnace chamber .in and around both of the boiler elements, each element comprising, vertical headers 3&6 connected by inclined water tubes; tubes 4 extending from the upper ends of the uptake headers horizontally or nearly so to a steam and water cross drum 5, placed above the:downtake headers G, and which drum is also connected by short tubes 7 to the upper ends of the downtake headers 6, thus usual water circulation.' External conncc tion are provided for the feed supply to the upper boller element and for the conduction of Water and steam :from the drum of the yupper boiler element to the drum of the lower boiler element. The feed enters the drum of the upper boiler element und passes through its circulating system, Where it becomes heated and partially evaporated, and then passes from the drum ofthe upper elemaking provision for the ment to the drum of the lower element where the evapmation continues, the water entering the lower drum having' the tcmpcrature o1' the steam. The steam from thc upper drum passes to the lower drum through a balance pipe. All ofthe steam then passes out of the drum of the lower element to the main steam supply pipe. The external circulation or course of the gases ot` comlnistion about the tubes is represented by the arrows in the sectional View of the accompanying drawings.

As shown in my former patent referred to, the boilers` in `the present instance are placed above a furnace occupying, if dc sired, the whole length of the setting, or more, and the whole width between the bciler walls, to enable the assembling; above a maxinuun grate arca on a given floor area ol' suficieut heating surface to absorb the beat teveloped on tbc large grate. It also, by the segregation of the circulation into two or ,more parts, enables the heating and tbc evaporation ot thc water by successive stages. ll is desirable in such a plant that there be but one water line for observation.

rlhis should be in the lower boiler element, from which all the steam from the boiler is conducted to the main steam supply pipe. ln order to accomplish this such connection must be made as will enable the feed to be introdlued directly into the drum of the upper boiler clement without concern as to thewater level in that element. It is preferable that a water line be maintained in the upper drum of the upper element at which level an overflow connection will be made by means of an open pipe to the steam space ot' the lower boiler element. A second method of transferring the water from the upper boiler element to the lower is a,4 follows :--'l`he upper boiler may be completely tilled with water and communication be made with the lower boiler clement by connecting an open pipe from the top of the upper drum to the steam space of the lower drum. In this case the steam and water will be discharged together through this connecting),r pipe. It is desirable, in order to keep the management of -tlie boiler as simpli as possible, that the pipe connecting,r the drums ot' tbc two boiler elements be free :trom a valve or any other obstruction, so that the whole boiler may be considered as a single unit and no manipulation be re Fencing the caused lr" ".Fig. 6 vrepresents an end View of shallow t f water level is fixed hy the internal Weir pipe het steam so as to increase the temperature of temperature in ine quired to maintain this condition of perfect free intercommunication between the drums of the two hoiler elements.

Referring to the accompanying drawings which forin a part of this specification: Figure Il, Sheet 1, 4is a side elevation partly in section. Fig. 2, Sheet 2, an end elevation of a structure embodying my invention. Fig. 3 represents a View in side elevation partly in section of the drum of the upper boiler element and shallowvessels therein arranged to receive the Water Yfed into the drum. Fig. 4 represents a sectional View in end elevation teken on line l---ll of Fig. 3p; Fig. 5 represents a top View of s portion of the shallow vessel C shown in Fig.` 3.

vessel C, Figs. 7 and 8 enlarged detail views of portions of the drum of. the upper boiler'.

ln the preferable method of feed Water supply, the water enters through the pipe 9, 4

valve l0, pipe li, valve l2 and pipe into the drum of the upper boiler element. The

l5, which is provided with one closed end and a slot lll in the top', through which the Water overiows into the pipe 16 and thence into the steam space or the drum S the lower boiler element. The purpose 'of the Weir :pipe is three-fold: lst--to determine the Water line in the drum, 2ndto insure e quiet and uniform outflow of Water, 3rd-- to expose s large surface ofi Waterfto the ofwater entering the lower drum, should that in the upper drum be ata. temperature `less than 'that in the lower drum. To provide for the emergency of a lack of the normal feed through the course described, an additional. Weiry pipe 19, provided With a similar overflow slot; is placed at a lower level in the drum 5. This Weir pipe is connected to the downcorner 16 through valve 18, by opening which 'the Water between the y respective levels may he util.ized-tomai1i tain thefeed supplypto `thelower drum S. By closingtheVv Valve i8, the Water level in 'n' will return to the upper Weir level the feed be again put into operation ano' cel'itinued with suilicu .nt volume. 18 is vconstructed to inteinopen ciurnnunication pe ldleading *i olor`r ,marked is requ spnces of hoth drums unequal prel fee "n the upper dr `m. li 'lout a balancepipc., a reduction of pressur. to a reduction lippe cause an uplow of the w drum to the upper. lino a, si:

pipe of ample area, such an action is impossible. If the upper drum should be lilled with Water as in the second method, 'the balance pipe will nethe needed.

ln order to raise the ten'iperature of the incoming feed Water in the drum of the upper element, it may he carried to a point A, high up inA thel steam space and dis charged into a .shallow vessel'B, and thence into a second broader shallow 'vessel C, for exposure to the steam in the drum and a consequent raise in temperature. The shallow Vessels B and C may be provided with means for roughening the surface of the water as it passes tlirough them for producing a larger surface exposure to the steam. This may be accomplished by laying a coarse Wire mesh in the bottom of the inclined 'Ves sels, or hy other means. The Water may lioilv longitudinally through vessel C and be discharged in a cataract at the end.

The pipe 22, through connections 2l and 23, communicates with the steein dry pipes 2O and 20A in the steam spaces of the upper and lower drums respectively. E20A in the' lower drum is in line with, but distinct from, dry pipe 25. The steam exit connection is from the dry pipe ozt' the lower drum and is shown at 2(5,-f1g'om -which pipe 27 leads to e superheater, through' a. header 28A.. The

superheater is composed of two square boxes 28 und 30, and the l! tubes 29, the ends of which terminate in the boxes 2S and 30. Thehex is divided into two compartments by partition at the middle of its length.. The steam is admitted to one compartment through box 28A, which. is hal'lifthe length of thejaox 28, the two being connected by new eral large nipples.' Another loon is placed in line with the hex 28A, and nippled to the second compartment of -hoX 28 and :terms the steam outlet ofthe superheater. This con-` struction causes the steam to poss through one-hall of. 'the superheater tubes 99,` then. long 'liudinallit -.tliio'ugh, portion of 'the lei lh oli be; 3'? und then through theother half ol the 'uoes 29. To the. end of the y second compartment olf the box 28 a fitting s connected, towhich one or moresafety he connected. From 'this iitting 3Q. steern is taken to `the mainline. ln Fig'. l i uws the fitting attached directly to the superhea'ter outlet. This itting ll` flanges for the. connection of safety vulves on of the branch 'pose of this fit end also one for the conne to the steam main. ting is two-fold: First:

'lo permit the aty ltewhrnent of safety valves su'llicient Ato cornply with the requirements rof the furnade and boiler. Second: This fitting is to be so designed that it .may he bolted to the rigid) parts of 'the boiler supports or of the huild-- ing, for the purpose of preventing the vibra-- "ons transmitted :from they steam main, be-

transmitted ,to the superheater. 4"lhe Safety 11'11l\'11.\r on titting1 32 willbe set .1t the l ot" tubes 11111l :1re then 1lireete1l 11111'111'1l 11nd uuixinnun .111111111 111111.\s111'11y 1lesire1l. Shoultl 111.1h111 sut'ety vulves be 1111.11ui11111l, they will be 11l11 fe1l in 1li1e11t 1:1111nnunieution with the 1li-111115 1i1ttlhe5e1111111te elements 11111l be set` 111 11 1111151111111. H111', 10H15. higher 1h1111 the1 1'11l1'11\ 1111 3:11. The 11ur11oS11 of thieI is 111 11111111111111 11 eonthutous tlow ot' 11.111111 through the su11111'l11111ter, luhouhl the llow 11.1511111111 to the 11111i11 outlet be .11u1l1l1111ly eutJ otl. l`i1i 1 will 11111111111V the overheutiog':m1-t the 11osuible1lestrurtion oli the superheuter. -\uxiliz1|' 1' feeds 111'1 also shown b v :1 1li11111t 1111111111111 ion Vl'roni the fem-l su1111l1f t) to the lower :lruin whi1'h is noriuully 11los111l b1' th11 1'11l1'11 235.111', throughtl1e11i1111l711111l 1'11l1'e210t'11o111 1111 iu- 1le1111n1l11nt source 11111l 1lire11t11| to th1` lower herul 1i through the 1'11l1'e 53S or 1h11 lower 1l1'u111 S,tl1rou;;1h the 1'11111139111-111 tl11.1 l1e111l11r 1'1" oil the 1111111111 boiler, through the vulve lt)` thus supplying( :111 i111l111 e111le11t 1111xi|i111111Y feed to e1111h boiler element. lhese uuxilinry1 't'e111l 11oun1111tio11s 1111111111 1111 essentiul element ot' the present invention. n

',lht1 su11e1111o11e1l 11111111111111111111 ot' 1h11 boilers 11111111 11 given floor 511111111 with 11` grule ASurtuee :1tl the. buse practically e1|u11l 111 11i1l floor 111111.11 11111l with 11 eoinbuution 11h11111l11111 envelopine,1 the boilers is like 111111 lshown in 111'11 loriner 1111le11l ret'111re1l 111 with the 11x111111tion ol tle 1111'1L11g'11111ent ot 1h11. butlles t'h11l 1lir1111t the 1111111111115l of 1111111l111stion from the l'urnuee el111111be1-totl1e exit. In the 111111511111 1111 '11111511- 111ent1 the hot ,111115115 ure 1li1'e11t111l l'roin 1h11` Y[11111111.1111 eh11111l1e 1 11.111155 the .high eiulh` ot' th11 111111111' tubehA of both boilers` where the eireuluting water is hottest 11111l 11 r1111i1l 11111111111- tion ot" .stenui occurs. The 111114115 then 11m-s 1lo1111111'11r1l 11ml reci-oss the1 res11e1'ti1'e groups 1111111.11155 the eooler 11mll ot the tubes to the 11x11. the eoursey ot the ,115115115 111110111111 the severul 11111115115 t'or1ne1l by the partitions, 11s

'show 11, being` .in1li1-z1te1l by the arrows in .Fife l ot' the 1lr11wi1111.

lu 1h11 11h11 ot' the 111111.11111` invention therel11t11'e 111-111111111111111111y ot the bollers 111111' he For example, the invention 11111111111 r11111lily 111111li111l to boilers, l1111111111l 11111111 lloom` 11u11 11l1111'e the other, 11nd ti1e1l in1le11en1leutly 11s is usu11l in large 111111111' houues.

l 11l11i111 11111111V invention:

1. Yin 11 511111111 generating 11l11nt. eolnprising' 11 serieu ot' su11er11ose1t boilers euch 111'0- \i1le1l with .st 111111 11n1l 11'111111' 1'lr11111's, .-1 weir in i1le of the 511111111 111111111 ot.' the u1111er boiler, haring 11 l'ree opening' to the outlet 11.1111111111- tiou, the s11i1l weir 11111111111 111; the required 11'11ter level, ull for the1 purposes described,

2. 1n 11 ste1u11 generating 11111111 compris iup; 11 set-i111; otE su11er11o se1l boilers, 111eh pro- 1'i1le1l with ste11111 11n1l water drinne, 11 weir 11l1111111l in tl111ute111111lru111 ot' the upper boiler 111 11n 111111111' position. 11 111eir11h1ce1l :1t 11 relatirely lower position, the two weirs being;r 11111111111-l111l to 11 w11ter 111111'111111111111, the 111111er one by 11 free 111111nin1 1,` 111111 the lower one by :1 1'11l1'e1l connection, ASuhl water (lowneomer having" its ternlinution in tl1111111111111111ce of the 1lru111 ot' the lower boiler.

ln testimonyr whereot' .l utlix iny signature in presence ot two witnesses.

`1\ll1\t )'l"l W. HEWALL. Witnesses:

A 1111 1 1.11111 G. Plgrr'r, ll. h'. (9111111111111, Jr. 

